JPS6328703B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a casting mold for a grid for lead-acid batteries.

Structures of conventional examples and their problems In general, grid bodies for lead-acid batteries are often manufactured by the following method. In other words, two molds (molds) made of cast iron or the like are prepared with lattice casting grooves carved in corresponding positions, one is fixed, and the other is a movable mold that can be moved relative to the fixed mold. After closing both molds to secure the lattice casting groove, molten lead or lead alloy is injected from the pouring hole provided at the top of the mold, and after cooling and solidifying, the two molds are opened. The lattice is taken out.

Usually, in a mold made by this method, the pouring port 1 is provided in the upper part of the mold, as shown in Fig. 1.
Directly below it is a 2-3m thick layer that serves as a riser.
It is provided with a band-shaped part commonly called a solid curtain 2 formed with a width of about 30 m/m. A gate portion 4 with a width of 2 to 3 m/m is provided from below the solid curtain 2 toward the lattice casting groove 3 forming the original lattice body, which supplies lead or lead alloy poured from a melting ladle. It is engraved as necessary.

In the conventional multi-piece lattice mold, which is often seen in lattice bodies for automobile lead-acid batteries and lattice bodies for small sealed batteries, as shown in Fig. The body casting groove 3 is divided according to each position and each shape.

Further, a current collecting convex portion 5 (commonly called an ear portion - hereinafter referred to as an ear portion), which is indispensable for the grid body, is carved on one side of the outer circumferential bone 6 of the grid body to be separated from the gate portion.

In recent years, as wireless electronic devices, especially video tape recorders and televisions, have become more portable, lead-acid batteries have become smaller and more sealed. The electrode plates that make up the device are also inevitably small. FIG. 1 shows a mold for a lattice body used in a conventional small sealed battery.The lattice body is miniaturized and made into multiple molds for efficient production.

FIG. 2 is a schematic diagram of a lattice body cast using this conventional mold. As shown in the figure, each of the lattice bodies is joined to each other via a connecting bone 7 having a length of 0.5 to 2 m/m at a portion of the lattice body outer peripheral bone 6'.
However, at the centerline portion, the grid body current collecting ears 5' are arranged in such a manner as to join a plurality of left and right grid bodies. Unlike other joints, this part has the weakest mechanical strength, and may be deformed during transport during the grid casting process or bent during active material pasting in the next process. , I had to bend over from time to time. In other words, as shown in Fig. 3, deflection occurs in the direction of the arrow from the central lattice current collecting ear 5', so the pasted multi-electrode plate is reduced to the predetermined size of one plate. In the process of cutting each electrode plate into individual pieces, the accuracy deteriorated due to bending when positioning the electrode plate, making it difficult to introduce automatic machines and causing problems such as the precision of each cut electrode plate being poor. .

Purpose of the Invention The purpose of the present invention is to solve the above-mentioned problems by changing the configuration of grooves in a lattice casting mold, and to efficiently manufacture lattice bodies with high precision. That is.

Structure of the Invention The present invention is a multi-cavity lattice mold, characterized in that a current collecting convex portion of the lattice is carved in a gate portion connected to a spout. More specifically, lattice grooves of the same shape are carved horizontally, and the lattice grooves are connected by connecting grooves. In addition, when grooves for multiple lattice bodies are carved in two stages, upper and lower, the lower lattice body is collected at a position vertically symmetrical to the current collecting convex part of the upper lattice body carved in the gate part. It is preferable to carve a casting groove for the electrical convex part.

Description of examples Examples of the present invention will be described below.

FIG. 4 is a schematic diagram of a lattice mold according to an embodiment of the present invention. As with conventional molds, pouring port 1
Although there is no change in the position or shape of the solid curtain 2, the gate portion 4' is provided with a grid current collecting ear portion 8, which is a feature of the present invention. In the first place, the role of the gate part 4' is to quickly spread the poured lead or lead alloy hot water throughout the solid curtain 2, and at the same time to exert a flow-restricting effect to supply the hot water to the grate casting groove 3. Therefore, the gate 4' is usually provided in the direction of gravity of the casting groove, for example, on the extension line of the vertical ribs 9 of the lattice frame ribs or the vertical ribs 10 of the lattice frame ribs, as shown in FIG. Therefore, the position of this gate 4' is almost determined naturally, but the position of the ear part 8 is
It is an important part of bringing out battery performance,
It is designed at the optimum position by considering the assembly method of the electrode plate group, which combines positive and negative electrode plates alternately.
It is arranged independently of the gate 4' mentioned above. For this reason, the positions of the ears 8 and the gate 4' may often overlap, but generally the width of the gate 4' is about 2 to 3 m/m, while the width of the ears 8 is about 3 to 6 m/m. Since the diameter is about m, by carving the ears upward and downward toward the spout, it can also function as a gate, and there will be no problem with casting. Conversely, if the ear portion 8 and the gate 4' do not overlap, they can be provided separately without any problem.

The required length of the ear in the width direction varies depending on the battery assembly method, but is generally about 6 to 15 m/m, so the length of the gate 4' can be determined accordingly.

In addition, as shown in Fig. 4, in order to improve the productivity of the lattice body, the gate part 4' is used in a multi-cavity mold.
It is best to carve lattice grooves of the same shape in the horizontal direction of the mold, arranging them within the possible range of the mold dimensions, and connecting them with a connecting groove. In addition, when lattice grooves are carved in two upper and lower stages. In this case, the ears 8' of the lower lattice body can be carved in the mold separately from the ears 8 on the gate part 4' in a corresponding vertically symmetrical positional relationship.

The mechanical strength of the lattice body cast by applying this type of groove-carving configuration to the mold is greatly improved compared to the conventional example shown in Figure 2, and the overall strength is well-balanced. The deformation and deflection of the lattice body, which tend to occur during the casting process and the pasting process, were significantly reduced, and the precision of the electrode plate was improved.

Effects of the Invention With the present invention, grid bodies and continuous bodies after pasting, which have been difficult to mechanize until now, can be made into one piece.
The process of dividing into individual sheets can also be easily put into practical use by improving the accuracy of the grid, resulting in improved quality and productivity.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional lattice casting mold, FIG. 2 is a diagram showing a lattice body cast with multiple pieces, and FIG. 3 is a diagram showing a lattice body with deflection.
FIG. 4 is a diagram showing a lattice casting mold according to an embodiment of the present invention. 1... Pouring spout, 2... Solid curtain, 3... Casting groove, 4, 4'
...Gate part, 5, 5', 8, 8'... Current collecting convex part (ear part), 6... Peripheral bone, 9, 10... Vertical bone.

Claims (1)

[Scope of Claims] 1. A multi-cavity lattice casting mold in which lattice grooves of the same shape are carved horizontally, each of the lattice grooves being connected by a connecting groove, and A casting mold for a lattice body for a lead-acid battery, in which a convex portion of the lattice body for current collection is carved into the gate part connected to the sprue. 2 A plurality of lattice grooves are carved in two stages, upper and lower, and a current collecting convex part of the lower lattice body is vertically symmetrical to the current collecting convex part of the upper lattice body carved in the gate part. A casting mold for a lattice body for a lead-acid battery according to claim 1, wherein a casting groove is carved for a lead-acid battery.